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Finding the Fourth Proportional to 326.72, 449.76 and 282.80

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Solution

The fourth proportional to 326.72, 449.76 and 282.80 is: 389.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    326.72 : 449.76 = 282.80 : x
  2. Step 2: Convert to fraction form
    326.72/449.76 = 282.80/x
  3. Step 3: Cross multiply
    326.72x = 449.76 × 282.80
  4. Step 4: Simplify right side
    326.72x = 127,192.13
  5. Step 5: Solve for x
    x = 127,192.13/326.72
  6. Step 6: Final answer
    x = 389.30

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.